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3D basics
Human eyes perceive objects from 2 different angles and our brain "calculates"
images from this information. This way we can tell the distance and position of an
object. For this reason, 3D material should be shot according to this principle.
Viewing 3D
A regular screen or TV can show images only in 2 dimensions, and various
technologies have been developed to enable perception of images in 3D. To this day,
all technologies share the following: You need special glasses to deliver different
information to the left and right eyes. We will examine these technologies in detail
later.
The three golden rules
• Stay within limits during recording: To make a 3D recording (view page 164) with
realistic depth information, certain limits must be respected. The most important
rule is not to go below the point of minimum distance. Minimum point is the
point in the picture, where the camera is the closest.
• Frame closest point: In order to place the 3D effect behind the imaginary frame,
both image components must over lay each other exactly at the closest point. At
the same time, the same objects must be visible at the edges of both partial
images, for which, if needed, you can use the Cropping function in the Media Pool
(view page 135).
Note: The imaginary window is a type of a plane, behind which the 3D movie plays.
You select the closest, frontmost point. Not keeping up with this rule can result in
the object to "jump out" of the imaginary window, which when used too much, can
cause headaches.
• Maintain realistic eye angles: Object with a 3D depth effect viewed as a red/cyan
image (Anaglyph) without glasses will appear displaced. This displacement
should, if possible, take up less than 1/30 of the entire image. Otherwise, it will
appear that the eyes are looking in different directions.
Notice: Displacement may only occur along the horizontal axis. Displacements on
the vertical axis and rotated portions must be adjusted.
Record 3D
The distance between eyes in humans is ca. 65 mm, which forms the so-called
"stereo base width". But because our eyes are dynamic and we can even "cross" our
eyes, it is possible to focus on objects that are closer.